Giraffes grow up to 19 ft - 5,8 m - tall, can weigh up to 1.7 tons and can run up to 40km/h. Grown up they are approximately six times the size of lions. Usually they are silent and gentle animals. Adult giraffes can easily smash a lion's head by kicking it with their hind legs, nevertheless it happens that they get attacked . Take your time and watch this interesting 45 min English documentary with Spanish subtitles on lions and giraffes in Tanzania:http://www.youtube.com/watch?v=d48AycCOFpA